Follow-up improvements from PR #180 review

[justin808]

Follow-up tasks from the Copilot AI review on PR #180:

Code Improvements

lib/cypress_on_rails/server.rb

• Extract Rails command detection into a separate method for better reusability
• Add error handling for server closing operations
• Add timeout mechanism for process termination to prevent hanging

lib/cypress_on_rails/state_reset_middleware.rb

• Use quote_table_name to prevent potential SQL injection (already implemented)

Documentation Improvements

VCR_GUIDE.md

• Add error handling for JSON parsing in GraphQL request matching examples

TROUBLESHOOTING.md

• Use more explicit check for filtering abstract model classes

Reference

Review: #180 (review)